Outage in Tessian US
Slow Defender Checks
Resolved Minor
February 24, 2026 - Started 14 days ago
- Lasted 2 days
Incident Report
Around 4pm UTC we began seeing delayed Defender checks for inbound emails. For API users, emails may experience up to a 600 second delay for emails to be checked and quarantined.
We are looking into this and will provide updates here.
Need to monitor Tessian US outages?
- Monitor all your external dependencies in one place
- Get instant alerts when outages are detected
- Be the first to know if service is down
- Show real-time status on private or public status page
- Keep your team informed
Latest Updates ( sorted recent to last )
MONITORING
14 days ago - at 02/24/2026 06:20PM
We are no longer seeing delays in CEPAPI Defender checks.
Our team is continuing to monitor this issue.
IDENTIFIED
14 days ago - at 02/24/2026 05:19PM
Around 4pm UTC we began seeing delayed Defender checks for inbound emails. For API users, emails may experience up to a 600 second delay for emails to be checked and quarantined.
We are looking into this and will provide updates here.
Latest Tessian US outages
Microsoft service degradation impacting mailflow - about 2 months ago
Outlook for Mac - Email Send blocked for some users - about 2 months ago
Intermittent M365 Add-in Timeouts - about 2 months ago
M365 Add-In: Silently failing checks for a subset of users - 3 months ago
Stop wasting hours on 'is it us or them?'
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
Start free trialNo credit card required · Cancel anytime · 6020 services available
Integrations with
